CN217204385U - Hydraulic control valve and excavator hydraulic system - Google Patents

Abstract

The utility model relates to a hydraulic element, and discloses a hydraulic control valve, which comprises a walking valve unit, a rotary valve unit, a movable arm valve unit, a bucket rod valve unit and a priority valve; the traveling valve unit, the rotary valve unit, the movable arm valve unit, the bucket valve unit and the bucket rod valve unit are connected between the oil supply oil path and the oil return oil path and are respectively connected with the traveling hydraulic mechanism, the rotary hydraulic mechanism, the movable arm hydraulic mechanism, the bucket hydraulic mechanism and the bucket rod hydraulic mechanism through working oil ports, the oil supply oil path comprises a first oil supply oil path and a second oil supply oil path, the priority valve is arranged between the rotary valve unit, the movable arm valve unit, the bucket valve unit and/or the bucket rod valve unit and the first oil supply oil path and/or the second oil supply oil path, confluence oil supply of the first oil supply oil path and the second oil supply oil path can be realized, and the oil supply amount can be controlled. The utility model also discloses an excavator hydraulic system.

Description

Hydraulic control valve and excavator hydraulic system

Technical Field

The utility model relates to a multiple unit, concretely relates to hydraulic control valve. Furthermore, the utility model discloses still relate to an excavator hydraulic system.

Background

The multi-way control valve is a core hydraulic component of a hydraulic system of the engineering machinery as a hydraulic control valve, and is used for operating and controlling independent or compound actions of each actuating mechanism of the engineering machinery, so that the centralized control of a plurality of actuating mechanisms is realized.

As shown in fig. 1, the hydraulic control valve used in the excavator hydraulic system is composed of two valve bodies, provided with two oil inlets P1 and P2, and provided with a traveling valve unit 1, a rotary valve unit 2, a boom valve unit 3, an bucket valve unit 4, and an arm valve unit 5 for controlling left-traveling, right-traveling, a rotary motor, a boom cylinder, a bucket cylinder, an arm cylinder, and an auxiliary device, respectively. In order to realize the operation control of the independent or compound action of all the actuators, the traveling valve unit 1 controls the left and right traveling, and when other actuators are simultaneously actuated, the oil of P1 is supplied to other actuators and the oil of P2 is supplied to the left and right traveling by switching the straight traveling valve 11, so that the straight traveling can be realized and the traveling can be kept from deviating. When the boom or the arm is operated and the other actuator is not used, the valve stems of the second boom valve 32 and the second arm valve 52 are provided outside the valve stems of the first boom valve 31 and the first arm valve 51 for merging, and the cylinder speed is increased to improve the operation performance. When the actuators with different pressures are operated simultaneously, in order to prevent most of oil from flowing to the actuator with lower action pressure, a priority valve ER is arranged to control the flow of different actuators, so that the preferential oil supply of the actuator with higher pressure is realized, and the compound actions such as the coordination of the rotation and the actions of a bucket rod, a movable arm, a bucket rod and the like are ensured. A holding valve HvR is arranged on a flow passage of the movable arm valve rod and the arm valve rod to the actuating mechanism, so that the leakage amount of the valve core is reduced, the position holding of the movable arm and the arm is realized, and the settlement of the movable arm and the arm is reduced. The middle position cutting-off function is realized through the two-position two-way reversing valve, the flow of hydraulic oil is cut off when the middle position of the valve core is cut off, and the pressure of an oil way is improved.

The multi-way reversing valves of the existing hydraulic control valves all use an open center valve structure, when the valve core is positioned at the middle position, an oil supply oil way is introduced into the valve body, the leakage amount of hydraulic oil in the reversing valves is large, and the energy loss is large; the confluence valve for realizing the confluence function and the priority valve ER for realizing the priority oil supply function are separately arranged, so that more oil ways are connected, and the structure is complex; the holding valve HvR is composed of a holding cone valve core and a holding pilot assembly, and has more oil circuit connections and a complex structure, which is not beneficial to early assembly and later maintenance. In order to overcome the above disadvantages, it is necessary to design a new hydraulic control valve.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a hydraulic control valve is provided, its oil circuit is simple, compact structure, production easy maintenance.

The utility model discloses further the technical problem that will solve provides an excavator hydraulic system, and its hydraulic control valve oil circuit is simple, and compact structure uses and maintains more conveniently.

In order to solve the above technical problem, an aspect of the present invention provides a hydraulic control valve, including a travel valve unit, a rotary valve unit, a boom valve unit, a bucket valve unit, and a stick valve unit; walking valve unit, rotary valve unit, swing arm valve unit, dipper valve unit and dipper stick valve unit all connect between fuel feeding oil circuit and oil return oil circuit to be connected with walking hydraulic pressure mechanism, gyration hydraulic pressure mechanism, swing arm hydraulic pressure mechanism, dipper hydraulic pressure mechanism and dipper stick hydraulic pressure mechanism through the working fluid port respectively, the utility model discloses a hydraulic control valve still includes the priority valve, the fuel feeding oil circuit includes first fuel feeding oil circuit and second fuel feeding oil circuit, the priority valve sets up swing valve unit, swing arm valve unit, dipper valve unit and/or dipper stick valve unit with between first fuel feeding oil circuit and/or the second fuel feeding oil circuit, in order to realize the confluence fuel feeding of first fuel feeding oil circuit and second fuel feeding oil circuit and the control of fuel supply.

Preferably, the priority valve is a two-position two-way valve, and when the priority valve is located at the first valve position, the oil inlet of the priority valve is communicated with the oil outlet in a one-way mode; and when the priority valve is positioned at the second valve position, the oil inlet of the priority valve is disconnected with the oil outlet. In the preferred embodiment, the two-position two-way priority valves connected to the two oil supply lines are controlled to conveniently supply the merged oil or the separate oil to the rotary valve unit, the boom valve unit, the bucket valve unit, and/or the arm valve unit, and to control the oil supply amount to the different valve units by controlling the flow rates of the different priority valves.

Preferably, the travel valve unit includes a straight travel valve, a right travel valve, and a left travel valve; the rotary valve unit includes a rotary valve; the boom valve unit comprises a first boom valve and a second boom valve; the bucket valve unit comprises a bucket valve; the bucket rod valve unit comprises a first bucket rod valve and a second bucket rod valve, and the right walking valve, the left walking valve, the rotary valve, the first movable arm valve, the second movable arm valve, the bucket valve, the first bucket rod valve and the second bucket rod valve are all closed center reversing valves. According to the preferred technical scheme, the right traveling valve, the left traveling valve, the rotary valve, the first movable arm valve, the second movable arm valve, the bucket valve, the first bucket rod valve and the second bucket rod valve all use closed center reversing valves, namely when the reversing valves are in the middle position, the oil supply oil path and the oil path in the valve body are in a cut-off state. Therefore, the leakage of the high-pressure hydraulic oil in the oil supply oil path through the oil passage in the reversing valve when the reversing valve is in the middle position can be reduced, and the middle position energy loss of the reversing valve is reduced.

Further preferably, the priority valves include a first priority valve, a second priority valve, a third priority valve, a fourth priority valve, a fifth priority valve, and a sixth priority valve; the first priority valve is provided between the first oil supply passage and an oil inlet of the rotary valve; the second priority valve is arranged between the second oil supply path and the oil inlet of the first movable arm valve, and a one-way valve is arranged between the first oil supply path and the oil inlet of the first movable arm valve; the third priority valve is arranged between the first oil supply oil path and an oil inlet of the bucket valve, and the fourth priority valve is arranged between the second oil supply oil path and the oil inlet of the bucket valve; the fifth priority valve is arranged between the first oil supply path and an oil inlet of the second bucket rod valve, and the sixth priority valve is arranged between the second oil supply path and the oil inlet of the second bucket rod valve. In this preferred embodiment, the flow rate of oil supplied from the first oil supply passage to the rotary valve can be controlled by the first priority valve; the second priority valve can switch the independent oil supply from the first oil supply circuit to the first movable arm valve, or the first oil supply circuit and the second oil supply circuit jointly supply oil to the first movable arm valve, and can control the flow of the second oil supply circuit to the first movable arm valve; the first oil supply oil path or the second oil supply oil path can be switched to supply oil to the bucket valve independently through the third priority valve and the fourth priority valve, or the first oil supply oil path and the second oil supply oil path jointly supply oil to the bucket valve, and the flow of the first oil supply oil path and the second oil supply oil path to supply oil to the bucket valve can be controlled; the first oil supply oil path can be switched to supply oil to the second arm valve independently through the fifth priority valve and the sixth priority valve, or the second oil supply oil path supplies oil to the second arm valve independently, or the first oil supply oil path and the second oil supply oil path jointly supply oil to the second arm valve, and the flow of the first oil supply oil path and the flow of the second oil supply oil path to supply oil to the second arm valve can be controlled.

Preferably, the utility model discloses a hydraulic control valve still includes the holding valve, the holding valve is the pilot operated check valve, the holding valve sets up swing arm valve unit and/or on the working port oil circuit of bucket rod valve unit. In the preferable technical scheme, the hydraulic control check valve can conveniently control the backflow of the hydraulic oil of the working oil port of the movable arm valve unit and/or the arm valve unit, so that the holding function of the movable arm hydraulic cylinder and/or the arm hydraulic cylinder is realized.

Further preferably, the holding valve includes a first holding valve provided on the working port oil passage of the first boom valve and a second holding valve provided on the working port oil passage of the second arm valve. In the preferred technical scheme, the first holding valve can conveniently control the on-off of the return oil path of the working oil port of the first boom valve, so that the corresponding boom hydraulic cylinder is held as necessary, and the corresponding boom is prevented from settling. The second holding valve can conveniently control the on-off of a return oil path of a working oil port of the second bucket rod valve, so that the corresponding bucket rod hydraulic cylinder is held when necessary, and the corresponding bucket rod is prevented from settling.

Preferably, the right travel valve, the left travel valve, the rotary valve, the first boom valve, the second boom valve, the bucket valve, the first bucket rod valve and the second bucket rod valve are three-position five-way reversing valves. In the preferred technical scheme, the three-position five-way valve is used and matched with a parallel multi-way valve combination form, so that independent or compound actions of a plurality of actuating mechanisms are realized by a simple valve structure, the cost of the hydraulic control valve is reduced, and the maintenance and the repair of the hydraulic control valve are facilitated.

Further preferably, the rotary valve, the first boom valve, the second boom valve, the bucket valve, the first arm valve and the second arm valve are all O-type neutral functions. Through this preferred technical scheme, the valve internal leakage of corresponding switching-over valve is littleer, and the pressurize performance is better, can make the pneumatic cylinder stop in optional position.

Preferably, the utility model discloses a hydraulic control valve still includes the back pressure valve, the back pressure valve sets up between oil return oil circuit and the oil tank. Through this preferred technical scheme, can guarantee that the hydraulic pump export keeps a constant pressure at least to can prevent the backward flow of hydraulic oil in the oil tank.

The utility model discloses the second aspect provides an excavator hydraulic system, include the utility model discloses the hydraulic control valve that the first aspect provided.

Through the technical scheme, the utility model discloses a hydraulic control valve, at the rotary valve unit, movable arm valve unit, be provided with the priority valve between bucket valve unit and/or dipper valve unit and first oil feed oil circuit and/or second oil feed oil circuit, can control the break-make of the first oil feed oil circuit that links to each other or second oil feed oil circuit and the oil circuit between the valve unit that corresponds respectively through this priority valve, thereby the valve unit that will correspond switches into by first oil feed oil circuit or the independent fuel feeding state of second oil feed oil circuit, perhaps by the state of first oil feed oil circuit and the confluence fuel feeding of second oil circuit, thereby the velocity of motion of the actuating mechanism that corresponds is improved when necessary to the fuel feeding, improve actuating mechanism's work efficiency. In addition, the oil supply amount of different valve units can be controlled by setting the sizes of the through holes of different priority valves, and the specific valve units are preferentially supplied with oil, so that when different execution mechanisms are operated simultaneously, a large amount of hydraulic oil is prevented from flowing to the execution mechanism with lower pressure, the oil supply balance between the execution mechanisms with different pressures, such as a rotary mechanism and an arm, a movable arm and an arm, is ensured, and the coordination of the actions of the different execution mechanisms is ensured.

The utility model discloses an excavator hydraulic system has used the utility model discloses a hydraulic control valve also has above-mentioned advantage.

Other technical features and advantages of the present invention will be further described in the following detailed description.

Drawings

FIG. 1 is a schematic diagram of a conventional hydraulic control valve;

fig. 2 is a schematic diagram of an embodiment of a hydraulic control valve according to the present invention.

Description of the reference numerals

1 traveling valve unit 11 straight traveling valve

12 right travel valve and 13 left travel valve

2 rotary valve unit 21 rotary valve

3 boom valve Unit 31 first boom valve Unit

32 second boom valve unit 4 bucket valve unit

41 bucket valve 5 arm valve unit

51 first arm valve 52 second arm valve

61 first priority valve 62 second priority valve

63 third priority valve 64 fourth priority valve

65 fifth priority valve 66 sixth priority valve

71 first holding valve 72 second holding valve

8 first oil supply circuit of backpressure valve I

II second oil supply circuit III oil return circuit

Detailed Description

In the present invention, unless otherwise specified, the terms of orientation or positional relationship as indicated by "upper and lower" used in the present invention are the ones in which the described device or component is actually used.

The terms "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit indication of the number of technical features indicated, and therefore, the features defined as "first", "second", "third", "fourth", "fifth", "sixth" may explicitly or implicitly include one or more of the features described.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and for example, the term "connected" may be a fixed connection, a detachable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, and it should be understood that the embodiments described herein are merely for purposes of illustration and explanation, and the scope of the present invention is not limited to the following embodiments.

As shown in fig. 2, an embodiment of the hydraulic control valve of the present invention includes a travel valve unit 1, a rotary valve unit 2, a boom valve unit 3, a bucket valve unit 4, and an arm valve unit 5. A first oil supply path I, a second oil supply path II and an oil return path III are arranged in the hydraulic control valve, the hydraulic control valve is composed of two valve bodies, the first oil supply path I and the second oil supply path II are respectively arranged in the two valve bodies, the first oil supply path I is connected with one oil pump of the hydraulic system through an oil inlet P1, the second oil supply path II is connected with the other oil pump of the hydraulic system through an oil inlet P2, and the oil return paths III in the two valve bodies are mutually connected and are connected to an oil tank of the hydraulic system through oil return ports R1 and R2. The traveling valve unit 1 is connected between the first oil supply path I and the second oil supply path II and the oil return path III, a working oil port of the traveling valve unit 1 is connected with the traveling hydraulic mechanism, and the oil supply state of the traveling hydraulic mechanism can be controlled by controlling the traveling valve unit 1, so that the traveling of the engineering machinery is controlled, and the functions of left and right traveling and straight traveling are realized. The rotary valve unit 2 is connected between the first oil supply oil path I and the oil return oil path III, a working oil port of the rotary valve unit 2 is connected with the rotary hydraulic mechanism, and the oil supply state of the rotary hydraulic mechanism can be controlled through controlling the rotary valve unit 2, so that the rotary motion of the engineering machinery is controlled. The movable arm valve unit 3 is connected between the first oil supply path I and the second oil supply path II and the oil return path III, a working oil port of the movable arm valve unit 3 is connected with the movable arm hydraulic mechanism, and the oil supply state of the movable arm hydraulic mechanism can be controlled by controlling the movable arm valve unit 3, so that the movement of the working arm of the engineering machinery is controlled. The bucket valve unit 4 is connected between the first oil supply oil path I and the second oil supply oil path II and the oil return oil path III, the working oil port of the bucket valve unit 4 is connected with the bucket hydraulic mechanism, and the oil supply state of the bucket hydraulic mechanism can be controlled through controlling the bucket valve unit 4, so that the movement of a bucket of the engineering machinery is controlled. Bucket rod valve unit 5 is connected between first oil feed oil circuit I and second oil feed oil circuit II and oil return oil circuit III, and the working oil port of bucket rod valve unit 5 is connected with bucket rod hydraulic pressure mechanism, can control bucket rod hydraulic pressure mechanism's fuel feeding state through the control to bucket rod valve unit 5 to the motion of control engineering machine tool bucket rod. The priority valve is arranged between one or more valve units in the rotary valve unit 2, the movable arm valve unit 3, the bucket valve unit 4 and the bucket rod valve unit 5 and the first oil supply oil path I and/or the second oil supply oil path II, the priority valve in the utility model is a hydraulic valve which can control the on-off of the oil path and limit the flow of the oil path, the oil supply state of one or more valve units in the rotary valve unit 2, the movable arm valve unit 3, the bucket valve unit 4 and the bucket rod valve unit 5 can be switched by controlling the priority valve, the first oil supply oil path I or the second oil supply oil path II can independently supply oil to the valve units, or the first oil supply oil path I and the second oil supply oil path II are combined to supply oil to the valve units, and the oil supply flow of different valve units can be limited, so that different hydraulic mechanisms simultaneously act, the hydraulic oil can be preferentially supplied to the hydraulic mechanisms with higher pressure, so that the phenomena that most of oil flows to the executing mechanism with lower pressure when the hydraulic mechanisms with different pressures act simultaneously, the oil supply of the hydraulic mechanism with higher pressure is insufficient, and the action is too slow are avoided, and the compound actions among different hydraulic mechanisms, such as the coordination of rotation and actions of a dipper, a movable arm, a dipper and the like, are ensured.

In some embodiments of the hydraulic control valve of the present invention, as shown in fig. 2, the used priority valve is a two-position two-way valve, when the valve core of the priority valve is in the first valve position, the oil inlet and the oil outlet of the priority valve are communicated in one direction, and different priority valves are provided with different flow areas, so as to limit the flow rates of different priority valves; when the valve core of the priority valve is in the second valve position, the oil inlet of the priority valve is disconnected with the oil outlet. Preferably, the used priority valve is a two-position two-way slide valve, such as a two-position two-way electromagnetic slide valve, and the position of the valve core of the priority valve at the first valve position is adjusted by adjusting the position of the valve core, such as by controlling the driving current of an electromagnetic valve, so as to adjust the opening degree of the valve port of the priority valve, thereby adjusting the oil supply flow rates of different priority valves and realizing the priority oil supply function of different hydraulic mechanisms.

The utility model discloses an in some embodiments of hydraulic control valve, as shown in FIG. 2, walking valve unit 1 includes sharp walking valve 11, right walking valve 12 and left walking valve 13, the work hydraulic fluid port A5 of right walking valve 12, B5 is connected with right walking hydraulic mechanism, the work hydraulic fluid port A1 of left walking valve 13, B1 is connected with left walking hydraulic mechanism, sharp walking valve 11 is used for switching the fuel feeding state of right walking valve 12 and left walking valve 13, guarantee right walking valve 12 and left walking valve 13's fuel feeding balance, guarantee the coordinated operation of right walking hydraulic mechanism and left walking hydraulic mechanism, keep the straight line walking of engineering machine tool not off tracking. The rotary valve unit 2 includes a rotary valve 21, and working ports a6 and B6 of the rotary valve 21 are connected to a rotary hydraulic mechanism, and the rotary valve 21 can control the oil supply state of the rotary hydraulic mechanism to control the rotary operation of the construction machine. The boom valve unit 3 includes a first boom valve 31 and a second boom valve 32, and is connected to the boom hydraulic mechanism through the working ports a2 and B2, and the first boom valve 31 and the second boom valve 32 control the oil supply state of the boom hydraulic mechanism, thereby controlling the movement of the boom of the construction machine. The bucket valve unit 4 includes a bucket valve 41, and the working ports a3 and B3 of the bucket valve 41 are connected to the bucket hydraulic mechanism, and the bucket valve 41 can control the oil supply state of the bucket hydraulic mechanism, thereby controlling the operation of the bucket of the construction machine. The arm valve unit 5 includes a first arm valve 51 and a second arm valve 52, and is connected to the arm hydraulic mechanism through the working ports a4 and B4, and the first arm valve 51 and the second arm valve 52 can control the oil supply state of the arm hydraulic mechanism, thereby controlling the movement of the arm of the construction machine. In the present embodiment, right travel valve 12, left travel valve 13, rotary valve 21, first boom valve 31, second boom valve 32, bucket valve 41, first arm valve 51, and second arm valve 52 are all closed-center directional valves. The utility model discloses well closed center switching-over valve indicates when the case of switching-over valve is in the meso position, and the inside oil duct of switching-over valve is in with the fuel feeding mouth of switching-over valve and cuts the state. Therefore, when the reversing valve is positioned at the middle position, high-pressure hydraulic oil in the oil supply oil way cannot enter the oil duct inside the reversing valve, leakage of the hydraulic oil through gaps of the oil duct inside the reversing valve is reduced, and therefore the middle position energy loss of the reversing valve can be effectively reduced.

As a specific embodiment of the hydraulic control valve of the present invention, as shown in fig. 2, the priority valve is provided in plural, and specifically includes a first priority valve 61, a second priority valve 62, a third priority valve 63, a fourth priority valve 64, a fifth priority valve 65, and a sixth priority valve 66. The first priority valve 61 is provided between the first oil supply passage i and the inlet of the rotary valve 21, controls whether oil is supplied to the inlet of the rotary valve 21, and can restrict the flow rate of the supplied oil to the rotary valve 21. The second priority valve 62 is arranged between the second oil supply path II and an oil inlet of the first boom valve 31, a check valve is arranged between the first oil supply path I and the oil inlet of the first boom valve 31, and when the second priority valve 62 is closed, the first boom valve 31 is solely supplied with oil by the first oil supply path I; when the second priority valve 62 is opened, the first boom valve 31 is supplied with oil from the first oil supply path i and the second oil supply path ii by merging, and the flow rate of the oil supplied from the second oil supply path ii to the first boom valve 31 can be restricted. The setting of check valve can prevent that the hydraulic oil in the second oil supply oil circuit II from flowing into first oil supply oil circuit I, guarantees the isolation of first oil supply oil circuit I and second oil supply oil circuit II. The third priority valve 63 is arranged between the first oil supply path I and an oil inlet of the bucket valve 41, the fourth priority valve 64 is arranged between the second oil supply path II and an oil inlet of the bucket valve 41, and the first oil supply path I alone supplies oil to the bucket valve 41 and the second oil supply path II alone supplies oil to the bucket valve 41 or the first oil supply path I and the second oil supply path II are combined to supply oil to the bucket valve 41 by controlling the third priority valve 63 and the fourth priority valve 64, so that the oil supply flow of the bucket valve 41 can be limited. The fifth priority valve 65 is provided between the first oil supply path i and the oil inlet of the second arm valve 52, and the sixth priority valve 66 is provided between the second oil supply path ii and the oil inlet of the second arm valve 52, and by controlling the fifth priority valve 65 and the sixth priority valve 66, it is possible to switch between supplying oil from the first oil supply path i alone to the second arm valve 52 and supplying oil from the second oil supply path ii alone to the second arm valve 52 or supplying oil from the first oil supply path i and the second oil supply path ii in confluence to the second arm valve 52, and it is possible to limit the oil supply flow rate of the second arm valve 52.

In some embodiments of the hydraulic control valve of the present invention, as shown in fig. 2, a holding valve is further provided in the hydraulic control valve of the present invention. The holding valve is a pilot operated check valve, and is provided on the working port oil passage of at least one of the boom valve unit 3 and the arm valve unit 5. When pressure oil does not exist at the control end of the hydraulic control one-way valve, the hydraulic control one-way valve is stopped in one way, leakage of hydraulic oil in a movable arm hydraulic mechanism and an arm hydraulic mechanism where the holding valve is located can be reduced, and settlement of a movable arm and an arm of the engineering machinery is reduced. When the control end of the hydraulic control one-way valve is filled with pressure oil, the hydraulic control one-way valve is conducted in two directions, and the normal flow of hydraulic oil in the movable arm hydraulic mechanism and the bucket rod hydraulic mechanism where the holding valve is located and the movement of the movable arm and the bucket rod of the engineering machinery are not influenced. Compared with a retaining valve in the existing hydraulic control valve, the hydraulic control valve has the advantages that a pilot assembly is omitted, an oil way is simplified, the structure is more compact, the production cost is reduced, and the maintenance and the repair of the hydraulic control valve are more convenient.

As a specific embodiment of the hydraulic control valve of the present invention, as shown in fig. 2, the hydraulic control valve of the present invention is provided with two holding valves, namely, a first holding valve 71 and a second holding valve 72, wherein the first holding valve 71 is disposed on the working oil port oil path of the first boom valve 31, so as to prevent the hydraulic oil in the boom cylinder from leaking through the working oil port of the first boom valve 31, and to maintain the position of the boom when the first boom valve 31 is located at the neutral position; the second holding valve 72 is provided on the hydraulic port oil passage of the second arm valve 52 to prevent the hydraulic oil in the arm cylinder from leaking through the hydraulic port of the second arm valve 52, and can hold the position of the arm when the second arm valve 52 is in the neutral position.

In some embodiments of the hydraulic control valve of the present invention, as shown in fig. 2, the right travel valve 12, the left travel valve 13, the rotary valve 21, the first boom valve 31, the second boom valve 32, the bucket valve 41, the first arm valve 51, and the second arm valve 52 in the hydraulic control valve are three-position five-way directional valves. Compared with the three-position eight-way valve which is widely used in the existing similar hydraulic control valve, the three-position eight-way valve has the advantages that the priority valve with the brand new structure is used, the oil supply oil way is optimized, the switching of the oil way in the hydraulic control valve is simpler, the simpler multi-way reversing valve can be used, the processing difficulty of the reversing valve is reduced, and the production and use cost is reduced.

As an embodiment of the hydraulic control valve of the present invention, as shown in fig. 2, the rotary valve 21, the first boom valve 31, the second boom valve 32, the bucket valve 41, the first arm valve 51, and the second arm valve 52 in the hydraulic control valve all use O-type neutral function switching valves. When the O-shaped middle position function reversing valve is positioned at the middle position, all the oil ports are completely closed, and the hydraulic actuating mechanism controlled by the O-shaped middle position function reversing valve can stop at any position. At the moment, each hydraulic oil way is not unloaded, the hydraulic cylinder is started stably, and the reversing position precision is high.

In some embodiments of the hydraulic control valve of the present invention, as shown in fig. 2, the hydraulic control valve of the present invention further comprises a back pressure valve 8, and the back pressure valve 8 is disposed between the oil return line iii and the oil tank. The back pressure valve is arranged to enable a constant back pressure to exist in the oil return line III, so that the outlet of the oil pump can have a lower constant pressure under the condition that the hydraulic system is unloaded. The existence of backpressure can also make the oil pressure in the oil return oil circuit III be greater than the oil pressure of oil tank all the time, prevents that hydraulic oil in the oil tank from flowing back to in the oil return oil circuit.

The utility model provides an excavator hydraulic system has used the utility model discloses the hydraulic control valve of arbitrary embodiment, therefore the structure of hydraulic control valve is simpler, and the function integrated level is higher, and the connection of oil circuit is also simpler, therefore can improve hydraulic system's stability, reduces hydraulic system's fault rate, and the hydraulic system's of being convenient for assembly and maintenance reduce hydraulic system's production, use cost.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "a specific implementation," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present disclosure, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical idea of the present invention is that it is possible to combine the simple variants of the technical solution of the present invention, including each specific technical feature, in any suitable way. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims (10)

1. A hydraulic control valve comprises a traveling valve unit (1), a rotary valve unit (2), a movable arm valve unit (3), a bucket valve unit (4) and an arm valve unit (5); the walking valve unit (1), the rotary valve unit (2), the movable arm valve unit (3), the bucket valve unit (4) and the bucket rod valve unit (5) are all connected between an oil supply oil way and an oil return oil way (III), and are respectively connected with a walking hydraulic mechanism, a rotary hydraulic mechanism, a movable arm hydraulic mechanism, a bucket hydraulic mechanism and a bucket rod hydraulic mechanism through working oil ports, it is characterized by also comprising a priority valve, wherein the oil supply oil path comprises a first oil supply path (I) and a second oil supply path (II), the priority valve is arranged between the rotary valve unit (2), the boom valve unit (3), the bucket valve unit (4) and/or the arm valve unit (5) and the first oil supply path (I) and/or the second oil supply path (II), so as to realize the control of the confluence oil supply and the oil supply quantity of the first oil supply oil path (I) and the second oil supply oil path (II).

2. The hydraulic control valve of claim 1, wherein the priority valve is a two-position, two-way valve having an oil inlet in one-way communication with an oil outlet when the priority valve is in the first valve position; and when the priority valve is positioned at the second valve position, the oil inlet of the priority valve is disconnected with the oil outlet.

3. Hydraulic control valve according to claim 1, characterized in that the walking valve unit (1) comprises a straight walking valve (11), a right walking valve (12) and a left walking valve (13); the rotary valve unit (2) includes a rotary valve (21); the boom valve unit (3) comprises a first boom valve (31) and a second boom valve (32); the bucket valve unit (4) comprises a bucket valve (41); the bucket rod valve unit (5) comprises a first bucket rod valve (51) and a second bucket rod valve (52), and the right walking valve (12), the left walking valve (13), the rotary valve (21), the first movable arm valve (31), the second movable arm valve (32), the bucket valve (41), the first bucket rod valve (51) and the second bucket rod valve (52) are all closed center reversing valves.

4. Hydraulic control valve according to claim 3, characterized in that the priority valves comprise a first priority valve (61), a second priority valve (62), a third priority valve (63), a fourth priority valve (64), a fifth priority valve (65) and a sixth priority valve (66); the first priority valve (61) is disposed between the first oil supply passage (I) and an oil inlet of the rotary valve (21); the second priority valve (62) is arranged between the second oil supply oil path (II) and an oil inlet of the first movable arm valve (31), and a one-way valve is arranged between the first oil supply oil path (I) and the oil inlet of the first movable arm valve (31); the third priority valve (63) is arranged between the first oil supply path (I) and an oil inlet of the bucket valve (41), and the fourth priority valve (64) is arranged between the second oil supply path (II) and the oil inlet of the bucket valve (41); the fifth priority valve (65) is arranged between the first oil supply path (I) and an oil inlet of the second bucket rod valve (52), and the sixth priority valve (66) is arranged between the second oil supply path (II) and the oil inlet of the second bucket rod valve (52).

5. The hydraulic control valve according to claim 3, further comprising a holding valve that is a pilot operated check valve provided on a working port oil passage of the boom valve unit (3) and/or the arm valve unit (5).

6. The hydraulic control valve according to claim 5, wherein the holding valve includes a first holding valve (71) and a second holding valve (72), the first holding valve (71) is provided on the working port oil passage of the first boom valve (31), and the second holding valve (72) is provided on the working port oil passage of the second arm valve (52).

7. The hydraulic control valve according to claim 3, wherein the right travel valve (12), the left travel valve (13), the rotary valve (21), the first boom valve (31), the second boom valve (32), the bucket valve (41), the first bucket rod valve (51), and the second bucket rod valve (52) are all three-position, five-way directional valves.

8. The hydraulic control valve according to claim 7, wherein the rotary valve (21), the first boom valve (31), the second boom valve (32), the bucket valve (41), the first arm valve (51), and the second arm valve (52) are all O-type neutral functions.

9. Hydraulic control valve according to any of claims 1-8, characterized by further comprising a back pressure valve (8), the back pressure valve (8) being arranged between the oil return line (III) and the oil tank.

10. An excavator hydraulic system comprising a hydraulic control valve as claimed in any one of claims 1 to 9.

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